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The Excelsior Diamond is a gem-quality diamond, and was the largest known diamond in the world from the time of its discovery in 1893 until 1905, when the Cullinan Diamond was found. It was found on June 30, 1893, at the Jagersfontein Mine in South Africa , 130 kilometres (81 miles) south east of Kimberley whose fame as a diamond mining center ...
The weight retention analysis studies the diamond rough to find the best combination of finished stones as it relates to per carat value. For instance, a 2.20-carat (440 mg) octahedron may produce (i) either two half-carat (100 mg) diamonds whose combined value may be higher than that of (ii) a 0.80-carat (160 mg) diamond plus a 0.30-carat (60 ...
In the wholesale trade of gem diamonds, carat is often used in denominating lots of diamonds for sale. For example, a buyer may place an order for 100 carats (20 g) of 0.5-carat (100 mg), D–F, VS2-SI1, excellent cut diamonds, indicating a wish to purchase 200 diamonds (100 carats (20 g) total mass) of those approximate characteristics.
The product description on the jeweler's website says that the east-west diamond ring features a Georgian-style setting in 18k white and yellow gold and the designer’s signature button back.
A 5.05-carat (1.010 g) Emerald-cut red diamond formerly known simply as "Red Diamond". This is the second-largest known red diamond. It was cut from a 35-carat (7.0 g) piece of boart discovered near Lichtenburg, South Africa. It reappeared in 2007 after a 37-year absence from sight, and was purchased by Kazanjian Brothers Inc. —
The necklace contained over 250 carats (50 g; 1.8 oz) of diamonds, among them a 16 carats (3.2 g; 0.11 oz) D-color Flawless clarity marquise cut. The Graff Pink of 24.78 carats, graded Fancy Intense Pink colour and with a November 2010 Sotheby's auction pre-sale estimate price of US$27 million to US$38 million (£17 million to £24 million).
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